<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport"
    content="width=device-width, initial-scale=1, maximum-scale=1,minimum-scale=1, user-scalable=no" />
  <title>层次选择器</title>
  <link rel="shortcut icon" href="../favicon.ico" type="image/x-icon" />
  <script src="./js/jquery-3.6.1.min.js"></script>
  <script src="./js/demo3.js"></script>
</head>

<body>
  <div class="box">
    <ul>
      <li>1</li>
      <li>
        <ol>
          <li>a</li>
          <li>b</li>
          <li>c</li>
        </ol>
      </li>
      <li>2</li>
      <li class="li_3">3</li>
      <li class="li_4">4</li>
      <li>5</li>
      <li class="li_4">6</li>
      <li>7</li>
    </ul>
  </div>
</body>

</html>